package com.xuecheng.framework.exception;

import com.google.common.collect.ImmutableMap;
import com.xuecheng.framework.model.response.CommonCode;
import com.xuecheng.framework.model.response.ResponseResult;
import com.xuecheng.framework.model.response.ResultCode;
import lombok.extern.slf4j.Slf4j;
import org.springframework.http.converter.HttpMessageNotReadableException;
import org.springframework.web.bind.annotation.ControllerAdvice;
import org.springframework.web.bind.annotation.ExceptionHandler;
import org.springframework.web.bind.annotation.ResponseBody;

/**
 * @author jl
 * @description
 * @date 2019-08-14 10:42
 */
@ControllerAdvice  //控制器增强
@Slf4j
@ResponseBody
public class ExceptionCatch {

    /**
     * 使用EXCEPTIONS存放异常类型和错误代码的映射，ImmutableMap的特点的一旦创建不可改变，并且线程安全
     */
    private static ImmutableMap<Class<? extends Throwable>, ResultCode> EXCEPTIONS;
    /**
     * 使用builder来构建一个异常类型和错误代码的异常
     */
    protected static ImmutableMap.Builder<Class<? extends Throwable>, ResultCode> builder = ImmutableMap.builder();

    static {
        //在这里加入一些基础的异常类型判断
        builder.put(HttpMessageNotReadableException.class, CommonCode.INVALID_PARAM);
    }


    /**
     * 捕获 CustomException异常
     *
     * @param e
     * @return
     */
    @ExceptionHandler(CustomException.class)
    public ResponseResult customException(CustomException e) {
        log.error("catch exception : {}\t,exception : ", e.getMessage(), e);
        ResultCode resultCode = e.getResultCode();
        return new ResponseResult(resultCode);
    }

    /**
     * 捕获Exception异常
     *
     * @param e
     * @return
     */
    @ExceptionHandler(Exception.class)
    public ResponseResult exception(Exception e) {
        log.error("catch exception : {}\t,exception : ", e.getMessage(), e);
        if (EXCEPTIONS == null){
            EXCEPTIONS = builder.build();
        }
        final ResultCode resultCode = EXCEPTIONS.get(e.getClass());
        if (resultCode != null) {
            return new ResponseResult(resultCode);
        } else {
            return new ResponseResult(CommonCode.SERVER_ERROR);
        }
    }

}
